I can confirm that this error message is unchanged since at least 1979:
Sixth Edition Unix on a PDP-11 had it. It was errno 28 then, too.
Derrick Brashear wrote:
> ... I get the idea there are lots of wordings in the AFS code which
> derive from things you'd hear in Pittsburgh, in particular, and, guess
> where I was?
Pittsburghese in AFS? "Yinz aht a space 'n'at"?
---Bob.